Patrick

Another mad idea. But who can tell me what exactly this Plywood is?

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I just recently picked up a supply of plywood offcuts for my ringbeam shuttering.

IMG_20200108_144455.thumb.jpg.8f02ab063e14b77bee1dab69f2aaf395.jpgIMG_20200108_144447.thumb.jpg.fa81ee1971f2aa96171b4f6dd89ffc6d.jpgIMG_20200108_144439.thumb.jpg.24d1cc613fd8afcbf0eb34af6c4ea2c9.jpg

It s coated 12mm ply, offcuts with 500mm x 1200mm.

Now as I can get them for next to free, I was thinking to do the sheeting of the house, possibly the first floor subfloor, with them. Should be better quality replacing osb with ply.

More work involved as basically 4.5 sheets to fix instead of 1 full one.

 

I m currently mainly interested if anybody knows what kind of ply this is. Couldn't really get any details out of the supplier of the offcuts.

It s like a slippery plastic coating with 1 side being smooth, the other being kind of mesh.

 

Any downsides of using this instead of OSB.

 

 

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Looks like horse box flooring ... 

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Google phenolic coated plywood. Can get it with various patterns on it.

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Amazing stuff, almost totally rot proof. Phenolic ply, used for trailer decks.

 

 

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And didn't a Grand Designs house use it for just about everything, inside and out?

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14 minutes ago, Patrick said:

Any downsides of using this instead of OSB.

 

I would hope that the core is always waterproof plywood but that might not be the case with some grades.. 

 

https://www.builderdepot.co.uk/18mm-phenolic-film-faced-shuttering-grade-plywood-2440mm-x-1220mm-8ft-x-4ft

 



After pressing the edges are also sealed to prevent moisture ingress. If cutting is required the exposed edges should be sealed with a rubber based paint in order to prevent any swelling.


 

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if covered with breather paper it shouldn't matter whether waterproof or not, covering mine with mdf 😀

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Hi Patrick,

us boaters know this as Bison board (phenolic ply) and it's used for exposed decks on narrow boats. Last for years in the open. A much better product than OSB both in durability and strength. Get as much of it as you can!

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James Latham at Greys stock it down here in 10x5 sheets. Buffalo board they call it. 

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9 hours ago, SteamyTea said:

Or Buffalo

What's the difference between a Bison and a buffalo? answer: you can't wash your hands in a buffalo...

 

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8 minutes ago, Simon R said:

you can't wash your hands in a buffalo

Sex is what posh people get the coal delivered in.

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17 hours ago, Patrick said:

I was thinking to do the sheeting of the house

 

Buffalo board goes round the outside...

 

Malcolm McLaren?

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1 hour ago, SteamyTea said:

Earworm for the day

 

Didn't expect some of you to be such old school bboys. Was more expecting some country music before I clicked on that video,  so once again a pleasant surprise on this forum that not every one here is a mid 70ies Dolly Parton fan 😉😋

 

The second take away from the answers is that it s kind of a good idea to sheet the house with those boards.

 

Thanks for both 😁

 

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25 minutes ago, Patrick said:

sheet the house with those boards.

If only it was soundproof, then we would not hear the country and western coming out.

 

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As it was just mentioned by @Simplysimon

These plywood sheets are probably not really vapour open. As I'm building timber frame with cellulose insulation and wanted to use smartply sheets as vapour barrier on the inside - would these be able to replace them as a vapour control layer on the inside  (taped joints and so on) and if they are (are they?) vapour impermeable, are they then useless for the outside sheeting or can this be overcome by the gaps inbetween the sheets (at the end, there will be a gap every 600mm. If that's not taped towards outside, is that enough for any vapour to escape if needed?)

 

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hi @Patrick,

going by this site, https://www.metsawood.com/global/Tools/DoP/DOPOpenDocuments/DoP_MetsäWood_Birch_Plywood_PF_2019-12-2_en.pdfit states a vapour barrier can be used in the substrate. it does give a vapour permeability, however, i've no idea as to its effectiveness. they are useless for the outside as they definately won't be vapour open. you will need something akin to panelvent dwd, medite vent or egger dhf if you can get it. i went with medite in and out

 

cheers

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On 10/01/2020 at 19:54, Simplysimon said:

@Patrick,. you will need something akin to panelvent dwd, medite vent or egger dhf if you can get it. i went with medite in and out

 

 

cheers

I had a look over this ones again and just can't find any decent answers on here, maybe just keep missing it. But what is the problem with OSB on the outside. I was originally planning to use standard osb3 for sheeting, as so many other houses are build with it.

Plywood on the outside even better as more vapour permeabel but also much more expensive.

It s  disputed how vapour open or vapour closed OSB is, at least I couldn't find a clear guidance on it. Common rule seems to be that OSB3 is too vapour permeabel to use as a vapour control layer on the inside on its own (even though that's still being done)  and at the same time, it has been mentioned that OSB is too vapour tight to use as outside sheeting - not letting enough vapour out (still a lot of houses, even passivhouses, are build with osb3 sheeting on the outside).

Also been looking for any fact sheet of the phenolic resin plywood but can't find any tests or details about its vapour permeability.

(tried to read and understand the metsawood sheet you posted @Simplysimon

But it doesn't make much sense - had to use this  :http://builddesk.co.uk/wp-content/uploads/2013/01/vapourResistances.pdf

 

To calculate what the µ in the metsawood paper actually mean). still not sure if it now is a good air barrier or not. Got in touch with some producers of these boards and waiting for a reply.

 

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29 minutes ago, Patrick said:

I had a look over this ones again and just can't find any decent answers on here, maybe just keep missing it. But what is the problem with OSB on the outside. I was originally planning to use standard osb3 for sheeting, as so many other houses are build with it.

Plywood on the outside even better as more vapour permeabel but also much more expensive.

It s  disputed how vapour open or vapour closed OSB is, at least I couldn't find a clear guidance on it. Common rule seems to be that OSB3 is too vapour permeabel to use as a vapour control layer on the inside on its own (even though that's still being done)  and at the same time, it has been mentioned that OSB is too vapour tight to use as outside sheeting - not letting enough vapour out (still a lot of houses, even passivhouses, are build with osb3 sheeting on the outside).

Also been looking for any fact sheet of the phenolic resin plywood but can't find any tests or details about its vapour permeability.

(tried to read and understand the metsawood sheet you posted @Simplysimon

But it doesn't make much sense - had to use this  :http://builddesk.co.uk/wp-content/uploads/2013/01/vapourResistances.pdf

 

To calculate what the µ in the metsawood paper actually mean). still not sure if it now is a good air barrier or not. Got in touch with some producers of these boards and waiting for a reply.

 

the vapour permeability of the outside sheeting material will depend upon the insulation used in the kit wall. with cellulose it will need something which has plenty of permeability, don't want soggy paper in the kit.

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Whereabouts is your racking strength coming from? 

Inner skin or outer, you would need to check with your frame designer as I don’t believe it will give you the racking strength you need in those small sizes. 

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16 minutes ago, Russell griffiths said:

Whereabouts is your racking strength coming from? 

Inner skin or outer, you would need to check with your frame designer as I don’t believe it will give you the racking strength you need in those small sizes. 

It would if you had "dwangs" across the upright studs at 500mm centers and lots more screws than a 1200x2400 single sheet

suppose it depends how cheap is cheap  by the time you add up the extra framing and screws  and time .

you would still need building wrap on outside to be sure and inner vcl as that would also be your air tightness layer.

 

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I could find a use for them too 🙂

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